functions in slice3.i - t

to_corners3

to_corners(list, ni, nj)
convert a LIST of cell indices in an (NI-1)-by-(NJ-1)-by-(nk-1)
logically rectangular grid of cells into the list of
2-by-2-by-2-by-numberof(LIST) cell corner indices in the
corresponding NI-by-NJ-by-nk list of vertices.
Interpreted function, defined at i/slice3.i line 488